The predictions of special relativity can sound implausible at first. What observational evidence do scientists have that the theory is correct?
A) Subatomic particles in accelerators exhibit effects of time dilation and mass increase at high speeds.
B) Light is always observed to travel at the same speed.
C) Time dilation can be observed in airplanes.
D) All of the above
D
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Atomic Nucleus: The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A. 3.6 × 10-13 B. 7.1 × 10-5 C. 5.1 × 10-9 D. 2.6 × 10-17
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. How long does it take for the ball to hit the ground?
A) 0.29 s B) 0.57 s C) 1.14 s D) 2.0 s E) 9.8 s
Causing an object to start moving on a frictional surface requires
A. less force than is needed to keep it moving on the surface. B. the same force as is needed to keep it moving on the surface. C. more force than is needed to keep it moving on the surface. D. a force equal to the weight of the object. E. a force opposite to the normal force.
An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy?
(melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)